The storage of the Bluetooth audio values have been changed in Mavericks / Yosemite the defaults are now with a process called “Bluetoothaudiod”, you can change the defaults by using the following example:
Sudo defaults write bluetoothaudiod "Apple Bitpool Min" 50
Please see below all the parameters I have changed, to read the defaults please enter the following command in terminal:
sudo defaults read bluetoothaudiod
enter your password:
MacBook-Pro:~ Ciaran$ sudo defaults read bluetoothaudiod
{
"AAC Bitrate" = 320;
"AAC CBR" = 1;
"Apple Bitpool Max" = 64;
"Apple Bitpool Min" = 50;
"Apple Initial Bitpool" = 50;
"Disable AAC codec" = 0;
"Disable AptX codec" = 0;
"Disable HFP" = 0;
"Enable AptX codec" = 1;
These setting work well with my Bose Soundink OE headphones, please be careful entering the values as they are case sensitive, I really hope this helps some of you out there.
Cheers.